Evidence for a polyalkyl nature of soil humin
Most of the studies on the soil organic matter have been carried out on colloidal substances soluble in alkaline extractants (humic acids and fulvic acids). The other major fraction - the humin - represents about half of the stabilized, biologically resistant pool of organic carbon on the Earth's surface [1]. Since their resistance to biodeg- radation, plant lignins have frequently been considered as major precursors of humin [1- 3]. The classical concepts of the nature of the humin have been questioned over the last few years. Recent studies using 13C NMR spectrometry point to the need of identifying the nature of paraffinic material in the fine soil fractions [4]. The origin of the polymethylene structures in soil humus remains particularly obscure since the lipids removed by solvent extraction always represent a minimal amount to the 13C NMR alkyl signals. The possibility of the accumulation in soils of highly aliphatic kerogen-like materials costitutes a suggestive hypothesis that would connect the early humification stages with the formation processes of fossil organic sediments of economic interest [5].
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | artículo biblioteca |
| Language: | English |
| Published: |
Springer
1991
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| Online Access: | http://hdl.handle.net/10261/58433 http://dx.doi.org/10.13039/501100003339 http://dx.doi.org/10.13039/501100007273 |
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